Mining machine



March .13, 1928. C.- F. OSGOOD MINING MACHINE I Filed Aug. 51. 1925 2 Sheets-Sheet 1 March 13, 1928.

' C. F. OSGOOD MINING MACHINE Filed Aug. 31. 1925 2 Sheets-Sheet 2 t mm PHW Patented Mar. 13, 1928.

UNITED STATES PATENT OFFICE.

CHARLES F. OSGOOI), OF CLAREMONT, NEW HAMPSHIRE, ASSIGNOR TO SULLIVAN MACHINERY COMPANY, A CORPORATION OF MASSACHUSETTS.

MINING MACHINE.

Application filed August 31, 1925. Serial No.53,724.

The most common method of machine mining coal employed in this country is the so-called room and pillar system. In practicing this method mining machines having cutter bars extcndin lon itudinall of the machine frames throughout cutting are employed to undercut the coal and are moved and guided by flexible feeding means.

' truck with the aid of this same flexible feed-.

ing means. It is therefore apparent that the feed operating mechanism is a highly important part of the machine and on its celerity of operation, ease of control and adaptability to different operations 1n large meas ure depends the success of the machine.

The movements of the machine between the truck and the face and onto and off of the truck may be, and preferably are, relatively rapid. Cutting across the face is practicable only at relatively low speeds. Sumping is possible in view of the smaller portion of the bar ordinarily presented to the work at a speed intermediate the normal cutting and the so-called moving speeds of the machine, sumping being possible atrates up to perhaps three times the normal cutting speed if the cutting conditions are favorable.

Among the objects of the invention is the provision of an improved mining maof parts. A further object of the invention is the provision of improved feeding mechanism in which three different predetermined feeding speeds respectively adapted to moving, sumping, and cutting may be obtained in which improved controlling means is provided interlocking the parts against simul taneous engagement of the gearing for effecting different feeding speeds.

Other objects and advantages of the invention will hereinafter more fully appear.

In a preferred form the invention may comprise a'machine frame slidable over a mine bottom and having at one end thereof a longitudinally projecting cutter bar, while at the other end a driving motor is provided. Between the motor and the end of the machine frame from which the cutter bar projects feed operating mechanism may be arranged. Preferably the feed operating mechanism comprises fast, intermediate or sumping, and slow speed gear trains, The feed operating mechanism is preferably of a type permitting feed in opposite directions during cutting and comprises a pair of rotatable feed operating members which may rotate upon horizontal axes at opposite sides of the longitudinal center line of the machine. The fecd operating members may be adapted either to cooperate with a single chain or with separate cables, depending upon their construction The feed operating mechanism, is preferably duplicated at opposite sides of the machine and comprises actuating means arranged at the longitudinal center line of the machine and similar plural speed driving trains at either side thereof respectively cooperate with different feed operating members. In a preferred form the feed operating mechanism may comprise three suitably connected worms rotating on vertical axes each operatively connected with the motoran'd each driving a pair of worm gears which are respectively coaxial with the feed operating members, and friction clutch means is provided for selectively connecting each of the worm wheel members in driving relation to its respective feed operating member. Suitable controlling means is provided for the friction clutches and interlocking mechanism may be provided to prevent the simultaneous loading of a plurality of clutches in the drive trains for the different feed operating members. Truck driving mechanism may be provided at the rear end of the machine.

For the purpose of illustrating the invention, one illustrative embodiment thereof is disclosed in the accompanying drawings, in which i Fig. 1 is a plan View with parts broken away showing the illustrative embodiment of the invention.

Fig. 2 is a view partially in side elevation and partially in longitudinal vertical section on the line 22 of Fig. 1.

Fig. 3 is a front end elevation of the mining machine.

*igj 4 is a transverse vertical. section on the line 4-4 of Fig. 1.

Fig. 5 is a transverse vertical section on the line of Fig. 1.

Fig. 6 is a fragmentary detail section showing an interlocking arrangement.

Referring to the drawings, 1 represents generally a mining machine constructed according to the illustrative embodimentcf the invention. This machine comprises a frame2, slidable upon its bottom 3 during cutting, and having thereon a motor 4 which constitutes a source of power for cutting and feeding mechanisms. The cutting mechanism comprises a cutter bar 5, havin thereon a cutter chain 6 provided with cutter bits 7 and adapted to be circulated by a cutter chain driving sprocket 8 rotating on a vertical axis and disposed adjacent the rear end of the frame 2 beneath the motor 4.

The feedingmechanism comprises a pair of rotatable feed operating members 9, arranged at the forward end of the machine frame 2 above the plane of the cutter bar and adapted to cooperate with flexible feeding portions or members, those shown being of the rope or cable winding form, though. obviously replaceable by chain sprocket members if desired. The members 9 and 10 rotate on parallel horizontal axes extending longitudinally of the machine frame and may be rotated at three different speeds: one adapted for cutting, one for sumping, and one for machine moving, etc. by means to be described herein. To permit the leading off of flexible feeding members 11, 12 in the different ways desirable during differentcutting and other operations pairs of guide rolls are arranged at op osite sides of the front end of the machine frame, there being a' pair ofcoaxial upper and lower rolls 13, 14 arranged at each side of the frame in front of a transverse vertical plane cutting the members 9, 1O midway of the length of the latter, and a pair at each. side to the rear of such plane, all the upper rolls 13 being cut by a horizontal plane tangent to the top surface of the members 9, 10 and all the lower rolls out by a horizontal plane tangent to the lower surface of the members 9, 10. Guide sheaves 15, 16 are also arranged at the rear end of the frame 2 to guide the cables or ropes as may be requisite.

The motor 4 has an armature 17, mounted on and driving a shaft 18. This shaft has a driving pinion 19 at its forward end which drives a gear 20 mounted on a shaft 21 jour naled in a bearing 22 on the frame. The

'sumping speed driving element.

shaft 21 at its forward end carries a bevel pinion 23 driving a bevel gear 24 rotatable on a vertical axis midway between the sides of the frame 2 and constituting a common driving element both for feeding and cutting mechanisms. At its rear end the arma ture shaft 18 carries a pinion 25 driving a gear 26 mounted on a shaft 27' journaled at 28 in the frame, and shaft 27 has in its rear end a socket 29 to receive for actuation any suitable connecting member or initial truck driving member (not shown).

The driving gearing for the cutter chain driving sprocket 8 includes a vertical shaft 30 driven by and supporting the gear 24. Adjacent the bottom of shaft 30 is a driving pinion 31 which may be connected to said shaft by a vertically slidable clutch element 32 splined to the latter. Pinion 31 drives a gear 33, which drives a larger gear 34 coaxial with and below the sprocket 8. Cut ter chain drive may obviously be cont-rolled by the clutch 32 which is controllable by any suitable means, as the transverse shaft 32.

The feed driving gearing is also driven by the gear 24. A vertical shaft 35 is arranged above and inalinement with theshaft 30 and is keyed to the gear 24 for rotation therewith. carries keyed thereon a. spur pinion 36 which meshes with and drives a spur gear 337 rotatable on a parallel axis andin its turn driving a gear 38 also rctatableon a parallel axis. The axes of rotation of pinion 36 and gears 37 and 38 all lie in the central longitudinal vertical plane ofthe machine and the gears 37 and 38 are keyed to and drive ver-' tical shafts 39 and 40 supported on suitable bearings 41 at their lower ends. The several shafts 35, 39 and 40 are each provided at their upper ends with ball-thrustbearings 42. Each of the shafts 35, 39 and 40 also carries and drives a worm. Shaft carries a worm 43 of very steep thread and is adapted to effect drive during moving to and from a truck, etc. Shaft 40 carries and drives a w0rm44 of gradual. inclination and provides cutting feed. Shaft 39 carries and drives a worm 45 Whose threads may have two or three times the inclination of the thread of worm 44 and this worm is the Obviously the speeds maybe varied by varying the steepness of the threads on the worms or by varying the sizes of the gears and pinions which actuate them.

Feed operating members 9 and 10 are respectively mounted on shafts 51 and 52 jour-' naled in bearings 53 and 54 adjacent their opposite ends. Each of the shafts has suitably mounted thereon and normally freely rotatable with respect thereto three worm wheels 55, 56 and 57 respectively driven by the worms 43, 45 and 44 and connectible through clutch means to be described to said tit) Just above the gear 24 the shaft 35 Hill shafts to drive the latter. To distinguish between the worm wheels and other parts cooperating with shafts 51 and 52, all those parts associated with shaft 52, and specifically designated by numeral in the drawings will be given an exponent"a. As the mountings for the worm wheels and their clutch mechanisms are generally similar, it will sutlice to describe one of them. Surrounding the shaft 51 and keyed thereto near its rear end is a sleeve 58 having a portion 59 with which a series of friction clutch discs 60 are engaged. The worm wheel is supported on spaced end members 61 journaled on bushings 62 and 63 respectively surrounding the sleeve 58 and the shaft 51. Within thespace between the members 61, within which the discs are housed, is a second series of clutch elements or discs 64 interleaved with the discs 60 and connected to the worm wheel 55. Openings 65 in one of the end memhere 61 permits clutch loading fingers 66 on a slidable plate 67 to apply pressure to the discs 60, 64 to effect loading of the clutch, The mountings of the worm wheels 56 and 57 are closely similar to those of the worm wheels 55 but the'openings in theend members of these devices are towards each other so that two clutches can be controlled by a single actuating member, and the loading plates of these clutches are designated 68 and 69 respectively. From the foregoing description it will be clear that pressure applied to plate 67 will cause the driving of worm wheel 55 by worm 43 to effect rotation of the shaft 51 at a machine moving speed, and application of pressure to plates 68 and 69 will in like manner cause rotation of the shaft 51 at speeds corresponding to sumping and cutting speeds.

The three clutches controlling rotation of shaft 51 are controlled by a pair of handles 71 and 72, while the clutches controlling the rotation of shaft 52 are controlled by handles 7 3, 74. Referring to Figs. 1, 4 and 5, a pair of shafts 75 and 76 extend across the machine, the former between the worms 44 and 45 and the latter between theworms 45 and 43. The shaft 75 has keyed thereon the handle 73 and also is surrounded bya sleeve 77 to which the handle 74 is connected. The shaft 76 issurrounded by coaxial sleeves 78 and 79. This shaft has keyed thereon the handle 72 and the sleeve 78 has the handle 71 keyed thereto. The sleeves 79 and 77 are connected by arms 80 and 81 respectively keyed thereto and connected by a link 82. Shaft 75is further surrounded by a sleeve 88 to which an arm 84 is keyed and this arm is connected by a link 85 to a parallel arm keyed to the shaft 76. A Y-shaped wheeled clutch loading member 86 is mounted on the shaft 75 and disposedbetween the plates 68 and 69. A similar loading member 87 is arranged on the-sleeve 8'3 and lies between the plates 68 and 69. Sleeve 79 carries a loading member 89 adjacent the plate 67 and sleeve 78 a member 90 adjacent plate 67. The handles 71 to 74 are each provided with looking pins which may secure them in clutch loading or unloading positions and in intermediate partial loading position if desired. ing longitudinally reciproc-able pins 91 mounted in openings 92 in members 93 Se cured to the frame cooperate with recesses 94 in the handles 71 and 72 and 7 3 and 74, the pins being of such length that the one of each pair of handles must always be in clutch unloading position, and thus but one worm wheel can be connected toeither shaft at any moment. 7

From the description given the mode of operation may readily be understood and it will be apparent that the control mechanism may be transposed to permit control from the opposite side of the machine if it is desired to cut in the opposite direction. To effect sumping the handle 72 may be turned to move'the arm 87 to load the clutch connecting the wheel 56 to shaft 51 and so cause drum 9 to wind in the cable 11. When it is desired to cut across the face handle 73 may be turned to load the clutch connecting wheel 57 'to shaft 52 and the drum 10 caused to wind in cable 12. To control the angle of the machine the handle 72 may be turned in the direction opposite to that mentioned above to partially load the clutch connecting worm wheel 57 to shaft51 and the rope 11 led rearwardly around one of thesheaves to the sheave 15 and off to a fixed anchor at the right hand rib. By proper manipulation of handles 71 or 74 the wheels55 or 55 may be connected to shafts 51 or 52 to wind in either cable'at a fast speed. To cut in an opposite direction it is simply necessary to rewind the cables 11 and 12 in an opposite direction on their feed operating members and if desired transfer the control mechanism. It is believed unnecessary to extend the description of possible uses of the device as from what has been said anyone skilled in the art will readily understand how the mechanism may be employed in other circumstances than those Specifically mentioned.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this formof the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is: v

1. In a mining machine, a driving motor and feeding means driven thereby including a feed operating member adapted to cooperate directly with flex ble feeding means Interlocking mechanisms includ-- driven at different speeds.

3. In a mining machine, a driving motor and feeding means driven thereby including a feed operating member rotatable upon a longitudinally extending axis and adapted to cooperate directly with flexible feeding means, and three worm gears disposed coaxially therewith and respectively rotating at angular rates appropriate for cutting, sumping and machine moving predetermined speeds.

4.- In a mining machine, a driving motor,

and feeding means driven by said motor including a plurality of feed operating members rotatingon parallelaxes and means driven by said motor and including three worm gears coaxial with each of said memhere for rotating the latter at cutting, sumping and machine moving predetermined speeds.

5. In a mining machine, a driving motor, and feeding means driven by said motor including a plurality of feed operating members rotating on parallel axes, and actuating means therefor driven by said motor and including three worm gears coaxial with each of said members and respectively rotating at angular rates appropriate for cutting, sumping and machine moving.

i 6. In a mining machine, a driving motor and feeding means driven thereby including a feed operating member adapted to cooperate directly with fiexible feeding means, and. actuating means therefor including three coaxial driving members each rotating at a rate different from each of the others and respectively having their rates of retation related in the ratio of the machine moving, the sumping, and the cutting speeds.

7. In a mining machine, a driving motor, a feed operating member, adapted to cooperate directly with flexible feeding means, and means driven by said motor for actuating said feed operating member at predetermined cutting, sumping and moving speeds, the latter in excess of maximum potential cutting speed under normal cutting conditions, including coaxial elements each driven by said motor throughout running of the latter at a different speed from each of the others, .and respectively rotating at common to the drive of both of speeds bearing like ratios tothe cutting,

sumping and moving rates of rotation of said feed operating member. i

8. In a mining machine, a driving motor, a feed operating member adapted to cooperate directly with flexible feeding means, and means driven by said motor for actuating said feed operating member at predetermined cutting, sumping and moving speeds, the latter in excess of maximum potential cuttin speed under normal cutting conditions, including coaxial elements rotating on axes alined with the axis of said feed operating member and each driven by said motor throughout running of the latter at a different speed from each of the others-and respec ively rotating at speeds bearing like ratios to the cutting, sumping and moving rates of rotation of said feed operating member.

9. In a mining machine, a driving motor,

a pluralityof feed operating members rotatable on parallel longitudinally extending axes, and transmission means between said motor and said members including three worms rotatable on vertical axeslying in the central longitudinal vertical plane of the machine, and worm gears driven by said worms and coaxial with said feed operating members. r

10.In a mining machine, feeding n1echanism including parallel feed operating members adapted to cooperate with flexible feeding means, and fast, slow and intermediate speed actuating means therefor including more than two worms disposed vertically between the axes of said members.

11. In a mining machine, feeding mech anism including parallel feed operating members adapted to cooperate with flexible feeding means, and fast, slow and intermediate speed actuating means therefor ineluding more than two worms disposed vertically between the axes of said members and said members.

12. In a mining machine, feeding mechanism comprising a feed operating member, a shaft, aplurality of friction clutches coaxial with said shaft and respectively loadable to effect driving of said shaft and of said feed operating membeigmeans common to two of said friction clutches for alternatively loading the same, means cooperatingivith another of said friction clutches for loading the latter, and interlocking connections between said loading means permitting loading of but one of said clutches at a time. v

13. In a mining machine, feeding mechanism comprising a feed operating member adapted to cooperate directly with flexible feeding means, a shaft, a plurality of friction clutches coaxial with said shaft and respectively loadable to effect driving thereof Inc and of said feed. operating member, and actuating means for said clutches comprising a plurality of operating handle members and interlocking mechanism precluding simultaneous operation of. said operating handle means to engage two of said clutches simultaneously.

14. In a mining machine, feeding mechanism including three coaxial clutches for effecting three distinct feeding speeds, and controlling means therefor including control members rotating on a common axis.

15. In a mining machine, feeding mechanism including three coaxial clutches and controlling means therefor including two control members rotating on a common axis.

16. In a mining machine, feeding mechanism including two sets of clutches, the individual clutches of each set being coaxial and the axes of the two sets being parallel, and controlling means for said sets of clutches including'sets of control members for each set of clutches, the individual con.- trol members of each set being coaxial and the axes of said sets of control members being parallel.

17. In a mining machine, feeding mechanism including two sets of clutches, the individual clutches of each set being coaxial and the axes of the two sets being parallel, and controlling means for said sets of clutches including sets of control members for each set of clutches, the individual control members for each set being coaxial and the axes of said sets of control members being parallel and transverse to said axes of said clutches.

18. In a mining machine, a horizontal motor disposed at the rear end of said machine, cutting mechanism driven thereby, and feeding means driven from the forward end of said motor including a feed operating member and means for driving said member at three distinct feeding speeds.

19. In a mining machine, a horizontal motor disposed at the rear end of said machine, cutting mechanism driven from the forward end of said motor, and feeding means at and driven from the same end of said motor and including a plurality of feed operating membersdriven' by said motor, one of which rotates on. an axis extending longitudinally of the machine.

20. In a mining machine,.a horizontal motor, cutting mechanism driven from the forward end of said motor, and feeding means driven from the same end of said motor in-' cluding a feed operating member rotatable on a horizontal longitudinallyextending axis and a plurality of terminal tran'smissionelements arranged coaxially with sai'dffeed operating member for effecting rotation there of at three distinct feeding speeds.

21. Ina mining machine, ahorizontalmotor, cutting mechanism driven from the forward end of said motor, and feeding means driven from the same end of said motor including a plurality of independently operable feed operating members rotatable on parallel axes.

22. In a mining machine, a horizontal motor, cutting mechanism driven from the forward end of said motor, andfeeding means driven from the same end of said motor including a plurality of independently oper able feed operating members rotatable on parallel horizontal longitudinally extending axes.

23. In a mining'machine, a horizontal motor, cutting mechanism driven from the forward end of said motor, feeding mechanism driven from the sameend of said motor including a feed operating member and means for driving said member at three distinct feeding speeds, and truck driving. means driven from the rear-end" of said motor.

In a mining machine, a frame, a horizontal motor carried by the rear end of said frame, cutting mechanism driven thereby. including a sprocket rotatable on a vertical axis at the rear end of said frame and a forwardly projecting rigid cutter bar, and feeding. means-driven by said motor including independently operable feed operating members.

' V 25. In a mining machine, a horizontal motor, and cutting. mechanism driven from the forward endof said motor and including a cutter chain sprocket rotatable on a vertical axis. at the rear end of said machine frame and driving gearing between said motor and sprocket including a gear disposed below said sprocket.

26. In a mining machine, a horizontal motor, and feeding means driven by said motor including means for feeding said machine at three distinct feeding speeds, said means having separate gear trains driving the same through three distinct terminal elements. 7

27. In a mining machine,-a horizontal motor, cutting mechanism driven from the forward end of said motor, and feeding means driven from the same end of said motor and including a feed operating member and means for driving said member at three distinct feeding speeds.-

28. In a mining machine, a horizontal motor, cutting mechanismdriven from; the forward end of said motor, and feeding means driven from the same end of said forward end of said motor, and feeding means driven by the sameen'd of said motor and located 'in advance of'the latter and ineluding a plurality of feed 0 crating members, the axis of one of sait members extending longitudinally of the machine and flexible feeding means cooperating with said members having flexible portions anchored to extraneous abutments during feeding of the machine.

30. In a mining machine, a motor, and cutting mechanism driven thereby including a cutter chain driving sprocket rotatable on a vertical axis and disposed beneath said motor, and driving gearing for said sprocket disposed in a plane below the latter.

31. In a mining machine, a motor, cutting mechanism driven thereby, and feeding means driven from the same end of said motor including a plurality of feed operating members, each adapted to cooperate with flexible feeding means, and means comprising separate gear trains for driving said members at machine moving, sumping, and cutting predetermined speeds including three distinct terminal elements.

32. In a mining machine, a motor, cutting mechanism driven by the forward end of said motor, feeding means driven from the same end of said motor, and truck driving means driven by the rear end of said motor, including independently or simultaneously operable feed operatin members.

33. In a mining macfiine, a driving motor and feeding means driven thereby including a feed operating member adapted to cooperate with flexible feeding means, and actuating means therefor including three coaxial terminal driving members, each rotating at a speed different from the speed of each of the others and respectively having their rates of rotation related in the ratio of the machine moving, the sumping, and the cutting speeds.

3% In a mining machine, a driving motor, a feed operating member adapted to cooperate with flexible feeding means, and means driven by said motor for actuating said feed operating member at predetermined cutting, sumping and moving speeds each of which different from each of the others, the latter in excess of maximum potential cutting speed under normal cutting conditions, including coaxial terminal driving elements each driven by said motor throughout running of the latterand respectively rotating at speeds bearing like ratios to the cutting, sumping and moving rates of rotation of said feed operating member.

35. In a mining machine, a driving motor, a feed operating member adapted to cooperate with flexible feeding means, and means driven by said motor for actuating said feed operating member at predetermined cutting, sumping and moving speeds, each of which is different from each of the others, the latter in excess of maximum potential cutting speed under normalcutting conditions, including coaxial terminal driving elements'rotating on axes alined with the axis of said feed operating member and each driven by said motor throughout running of the latter and respectively rotating at speeds bearing like ratios to the cuttin sumping and moving rates of rotation of said feed operating member. v

36. In a mining machine, feeding mechanism comprising a feed operating member adapted to cooperate with flexible feeding means, a shaft coaxial with said member, a

plurality of friction clutches coaxial with trains for effecting rotation of said fced opcrating member at three distinct feeding spleeds appropriate for propelling the ma- 0 inc at cutting, sumping and machine moving speeds. i n

38. In a mining machine, a driving motor, and feeding means driven by said motor in cluding a feed operating member and three worm gears disposed coaxially therewith and respectively rotating at different angular rates appropriate for cutting, sumping and machine moving predetermined speeds.

39. In amining machine, a driving motor, and feeding means driven therebyincludi a feed operating member adapted tocoopei ate with flexible feedingmeanaand three gears disposed coaxially therewith and respectively rotating at different angular rates appropriate to cutting, sumping and machine moving predetermined speeds.

40. In a mining machine, a driving motor,

and feeding means driven by saidmotor in cluding a plurality of feed operating members and means driven by said motor and including a plurality of gears coaxial with each of said feed operating members and re spectively operative for rotating the latter at mutually different cutting, sumping and machine moving predetermined speeds. f

41. In a mining machine of the type slidable on the mine bottom, a motor, cutting mechanism driven from the forward end thereof including a forwardly projecting cutter bar, feeding mechanismfor feeding the machine during cutting overthe mine bottom driven from the forward end of said motor, and truck driving mechanism including driving gearing driven from the opposite end of the motor. a

till

lllll Ill! 42. In a mining machine, a horizontal motor having its axis extending longitudinally of the machine, said motor being disposed at the rear end of said machine, cutting mechanism driven from the forward end of said motor including a forwardly projecting cutter bar, feeding mechanism driven from the forward end of said motor including independently operable feed operating members each adapted to cooperate with flexible feeding means, and truck driving mechanism driven from the rear end of said motor.

43. In a mining machine, a motor having its axis extending longitudinally of the machine, cutting mechanism driven from the forward end of the motor, and feeding means driven from the forward end of said motor including a plurality of independently operable feed operating members each adapted to cooperate with flexible feeding means, and mechanism driven by said motor for selectively rotating said feed operating members at mutually different predetermined cutting, sumping and machine moving speeds.

44:. In a mining machine, adriving motor, a plurality of feed operating members, and transmission means between said motor and said members including three gears rotatable on vertical axes and gears driven by said gears, each at a speed different from that of each of the others,-and coaxial with said feed operating members.

45. In a mining machine, feeding mechanism including a plurality of parallel feed operating members adapted to cooperate with flexible feeding means, and fast, slow and intermediate speed actuating means therefor including three gears disposed vertically on parallel axes between the axes of said members.

46. In a mining machine, feeding mecha nism including a plurality of parallel feed operating members adapted to cooperate with flexible feeding means, and fast, slow and intermediate speed actuating means therefor including three gears disposed vertically onparallel axes between the of 48. In a mining machine, a machine frame slidable'on its bottom on the mine bottom, a motor disposed at the rear end of said frame and having its axis extending longitudinally thereof, cutting mechanism driven from the forward end of said motor including a rigid cutter bar extending forwardly lengthwise of said frame, and feeding means disposed in advance of and'driven from the forward end of said motor including a plurality of simultaneously or separately operable feed operating members each being adapted to cooperate with flexible feeding means, one of said members being disposed on a horizontal axis extending longitudinally of the machine.

49. In a mining machine, a machine frame slidable on its bottom on the mine bottom, a motor disposed at the rear end of said frame and having its axis extending longitudinally thereof, cutting mechanism driven from the forward end of said motor including a rigid cutter bar extending forwardly lengthwise of said frame, and feeding means driven from the forward end of said motor including a plurality of simultaneously or separately operable feed operating members located in advance of said motor and each being adapted to cooperate with flexible feeding means, and truck driving mechanism driven from the rear end of said motor. i

In testimony whereof I aflix my signature.

CHARLES F. OSGOOD.

CERTIFICATE 0F GORREGTKGN.

Patent No. 1,662,799. Granted March 13, 1928, to

CHARLES F. OSGOOD.

It is hereby certified that error appears in the printed. specification of the above numbered patent requiring correction as follows: Page 5, iine 6, claim 13, for the word "means" read "members";same page, lines 1% anti 51, claims 14 and 19, and page 6, line v18, claim 31, strike out comma; same page, lines 29 and 30, claim 32, strike out the words "including ietiepentiently or simuitaneousiy operabie feed operating members" and insert the same to follow after the word "motor" in line 27; lines 28, 36 and 197, claims 32, 33 and 39, strike out the comma; line 62 claim 35, strike out the comma second occurrence; and that the said Letters Patent should be read with these corrections therein that the same may conform to the record of the case in the Patent Office.

Signed and sealed this 10th day of April, A. D. 1928.

M J. Moore, (Seal) Acting Commissioner of Patents. 

